DESCRIPTION

Showhostkey outputs (on standard output) a public key suitable for this
host, in the format specified, using the host key information stored in
/etc/ipsec.secrets. In general only the super-user can run this
command, since only he can read ipsec.secrets.
The --txt option causes the output to be in opportunistic-encryption
DNS TXT record format, with the specified gateway value. If information
about how the key was generated is available, that is provided as a
DNS-file comment. For example, --txt10.11.12.13 might give (with the
key data trimmed for clarity):
; RSA 2048 bits xy.example.com Sat Apr 15 13:53:22 2000
IN TXT "X-IPsec-Server(10)=10.11.12.13 AQOF8tZ2...+buFuFn/"
No name is supplied in the TXT record because there are too many
possibilities, depending on how it will be used. If the text string is
longer than 255 bytes, it is split up into multiple strings (matching
the restrictions of the DNS TXT binary format). If any split is needed,
the first split will be at the start of the key: this increases the
chances that later hand editing will work.
The --version option causes the version of the binary to be emitted,
and nothing else.
The --verbose may be present one or more times. Each occurance
increases the verbosity level.
The --left and --right options cause the output to be in ipsec.conf(5)
format, as a leftrsasigkey or rightrsasigkey parameter respectively.
Again, generation information is included if available. For example,
--left might give (with the key data trimmed down for clarity):
# RSA 2048 bits xy.example.com Sat Apr 15 13:53:22 2000
leftrsasigkey=0sAQOF8tZ2...+buFuFn/
The --dhclient option cause the output to be suitable for inclusion in
dhclient.conf(5) as part of configuring WAVEsec. See
<http://www.wavesec.org>.
If --ipseckey is specified, the output format is the text form of a DNS
IPSECKEY record (see RFC4025); the host name is the one included in the
key information (or, if that is not available, the output of
hostname--fqdn), with a . appended. The gateway information, if
provided, is is included, otherwise, the gateway is assumed to be self,
and to be of type FQDN. Generation information is included if
available. For example (with the key data trimmed down for clarity):
; RSA 2048 bits xy.example.com Sat Apr 15 13:53:22 2000
xy.example.com. IN IPSECKEYKEY floyd albert
If --key is specified, the output format is the text form of a DNS KEY
record; the host name is the one included in the key information (or,
if that is not available, the output of hostname--fqdn), with a .
appended. The IPSEC usage of the DNS KEY is deprecated (see RFC3445),
use IPSECKEY. Again, generation information is included if available.
For example (with the key data trimmed down for clarity):
; RSA 2048 bits xy.example.com Sat Apr 15 13:53:22 2000
xy.example.com. IN KEY 0x4200 4 1 AQOF8tZ2...+buFuFn/
Normally, the default key for this host (the one with no host
identities specified for it) is the one extracted. The --id option
overrides this, causing extraction of the key labeled with the
specified identity, if any. The specified identity must exactly match
the identity in the file; in particular, the comparison is
case-sensitive.
There may also be multiple keys with the same identity. All keys are
numbered based upon their linear sequence in the file (including all
include directives)
The --file option overrides the default for where the key information
should be found, and takes it from the specified secretfile.

DIAGNOSTICS

A complaint about “no pubkey line found” indicates that the host has a
key but it was generated with an old version of FreeS/WAN and does not
contain the information that showhostkey needs.

FILES

/etc/ipsec.secrets

SEEALSO

HISTORY

BUGS

Arguably, rather than just reporting the no-IN-KEY-line-found problem,
showhostkey should be smart enough to run the existing key through
rsasigkey with the --oldkey option, to generate a suitable output line.
The need to specify the gateway address (etc.) for --txt is annoying,
but there is no good way to determine it automatically.
There should be a way to specify the priority value for TXT records;
currently it is hardwired to 10.
The --id option assumes that the identity appears on the same line as
the :RSA{ that begins the key proper.